Spotlight

Keith Vetter 2006-01-05 : There's a whole class of image affect programs that I've always wanted to write--affects where as you move your mouse across the image it morphs the image at that point in some way. Two classic examples of this are the spotlight and magnifying glass simulations. Unfortunately tk is not very good at this kind of computing--too many numbers to be crunched.

Be that as it may, this is my attempt at the spotlight simulation. How well it works depends a lot on your computer--it behaves great on my fast laptop and horrible on my old desktop. There's a bug when the spotlight would extend over the edge of the image that I got too lazy to correct.

I've included a image to demo with, but you can use your own image easily enough by editing this script and changing what img::org is.

uniquename 2013aug18:

For readers who do not have the time/facilities/whatever to setup the following code and execute it, here is an image to show what the code does.

I do not have the 'Img' extension package on my computer (and have no intention of ever installing it). The sample data that Vetter provided in the code below requires the 'Img' extension.

I changed the code a little to use the earthris.gif file of the Tk demo directory (/usr/share/doc/tk8.5/examples/images/ on most Linux installations). I simply changed the 'image create photo' statement to use '-file' instead of '-data'. And I commented out the 'package require Img' statement.

For this image, I turned on the 'Darken' checkbutton so that the 'spotlight' circle would be more noticeable. I took this screenshot when I had moved the mouse-cursor over the lower-left part of the image. Note that a portion of the moon's surface is spotlighted. And note that the black sky above that spot was not turned to gray. Apparently Vetter is multiplying colors by a factor but not adding to the pixel colors. (Of course, you could change the code to make the spotlight work 'as you like it'.)

 ##+##########################################################################
 #
 # Spotlight.tcl -- Shines a spotlight on a image
 # by Keith Vetter, January 2006
 #
 
 package require Tk
 package require Img
 
 set S(sz) 60                                    ;# Size of spotlight square
 set S(sz2) [expr {$S(sz)/2}]
 set S(sz22) [expr {$S(sz2)*$S(sz2)}]            ;# Square of radius
 set S(brightness) 200                           ;# How bright the spotlight
 set S(dark) 0                                   ;# Dark image flag
 set S(darker) 50                                ;# How much to darken image by
 
 proc DoDisplay {} {
    global S
    
    wm title . "Spotlight"
    canvas .c -width $S(w) -height $S(h) -highlightthickness 0
    .c create image 0 0 -image ::img::img -anchor nw
    .c create image 0 0 -image ::img::small -anchor c -tag small
    
    frame .buttons -bd 2 -relief ridge
    scale .bright -label "Brighness %" -from 0 -to 800 \
        -variable S(brightness) -orient h -command FMove -relief raised
    .bright configure  -font "[font actual [.bright cget -font]] -weight bold"
    option add *font [.bright cget -font]
    
    checkbutton .dark -text "Darkened Image" -variable S(dark) \
        -relief raised -command DarkenOriginal
    button .about -text "About" -command About
    
    pack .c .buttons -side top -fill both -expand 1
    pack .bright .dark .about -side left -expand 1 -in .buttons
    .c create oval -100 -100 -100 -100 -tag box -fill {} -outline black -width 2
    
    bind .c <Motion> [list MMove %x %y]
    bind .c <Leave> [list MLeave]
    update
    MLeave
 }
 proc MLeave {} {
    .c coords box -100 -100 -100 -100
    .c coords small -1000 -1000
 }
 proc MMove {x y} {
    global S
    
    .c coords small $x $y
    
    set xy [list [expr {$x-$S(sz2)}] [expr {$y-$S(sz2)}] [expr {$x+$S(sz2)}] [expr {$y+$S(sz2)}]]
    .c coords box $xy
    
    # Bug here when xy extends past edge of image. Too lazy to fix it.
    catch {
        eval ::img::small copy ::img::img -from $xy
        Recolor ::img::small $S(brightness)
    }
 }
 proc FMove {args} {
    foreach var {x y} val [.c coords small] {
        set $var [expr {int($val)}]
    }
    MMove $x $y
 }
 
 proc Recolor {img perc {circle 1}} {
    set w [image width $img]
    set h [image height $img]
    set cx [expr {$w/2}]
    set cy [expr {$h/2}]
 
    set d 0
    for {set x0 0; set x1 1} {$x0 < $w-2} {incr x0; incr x1} {
        set data [$img data -from $x0 0 $x1 $h]
        set y0 -1
        foreach rgb $data {
            incr y0
            if {$circle} {
                set d [expr {(($x0-$cx)*($x0-$cx)) + (($y0-$cy)*($y0-$cy))}]
            }
            if {$d <= $::S(sz22)} {
                lset data $y0 [::tk::Darken $rgb $perc]
            }
        }
        $img put $data -to $x0 0
    }
 }
 
 proc DarkenOriginal {} {
    if {[lsearch [image names] ::img::dark] == -1} {
        image create photo ::img::dark
        ::img::dark copy ::img::org
        
        destroy .warn
        toplevel .warn
        wm transient .warn .
        wm title .warn "Spotlight"
        wm protocol .warn WM_DELETE_WINDOW list
        label .warn.l1 -text "Please Wait" -fg red -font {Helvetica 36 bold}
        label .warn.l2 -text "This may take a while" -font {Helvetica 18 bold} \
            -anchor w
        grid rowconfigure .warn 0 -minsize 15
        grid .warn.l1 -row 2 -padx 20
        grid .warn.l2 -row 3
        grid rowconfigure .warn 999 -minsize 20
        wm withdraw .warn
        update
        set x [expr {[winfo rootx .] + [winfo width .]/2 - [winfo width .warn]/2}]
        set y [expr {[winfo rooty .] + 40}]
        wm geom .warn +$x+$y
        wm deiconify .warn
        update
        
        Recolor ::img::dark $::S(darker) 0
        destroy .warn
        
    }
    if {$::S(dark)} {
        ::img::img copy ::img::dark
        set ::S(brightness) [expr {$::S(brightness) / $::S(darker) * 100}]
    } else {
        ::img::img copy ::img::org
        set ::S(brightness) [expr {$::S(brightness) * $::S(darker) / 100}]
    }
 }
 proc About {} {
    set msg "Spotlight\nby Keith Vetter, January 2006"
    tk_messageBox -message $msg
 }
 ################################################################
 
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 ################################################################
 
 image create photo ::img::org -data $idata
 image create photo ::img::img
 ::img::img copy ::img::org
 image create photo ::img::small -width $S(sz) -height $S(sz)
 set S(w) [image width ::img::img]
 set S(h) [image height ::img::img]
 DoDisplay
 return

Category Image Processing